add Github Action refresh our dev certs (#260)
add Github Action refresh our dev certs (#260)

Our dev certs keep needing refreshing, but I'd rather not do it by hand. And I'd
rather not have to generate RSA keys on every test run. So, let's automate this.
jmhodges/howsmyssl,jmhodges/howsmyssl,jmhodges/howsmyssl